Figure 4

Marginal posterior probability distribution for parameters estimated by the isolation-with-migration model. Marginal posterior probabilities are estimated for (A) divergence time between the northern and southern EPR, (B) the forward-in-time migration rates between the northern and southern EPR, where m_s represents south-to-north migration and m_n north-to-south and (C) effective population sizes of the ancestral population (N_a) and the two sister populations (i.e. N_n and N_s for the northern EPR population and the southern EPR population, respectively). Values estimated using IMa and 90% highest posterior density intervals of these parameters are presented in additional file 4.